About Us

Gleason Architects, P.C. is a full service architectural design firm founded by Thad Gleason in March of 2001 based upon a principle of competent design and personalized client service. We have a dedicated staff of licensed architects and project managers who are responsive toward each client's needs. Gleason Architects, P.C. is an Illinois Professional Corporation and our office is located in the growing community of Sugar Grove, Illinois.


Gleason Architects, P.C. is capable of providing full architectural and engineering design services from concept through completion. Besides our in-house capabilities, we maintain relationships with several professional engineering consultants with expertise in a variety of disciplines.

The principal and staff bring many years of combined experience in a broad range of building types including Senior Care, Healthcare, Affordable Housing, Aircraft Hangers, Retail, Automotive, Office/Warehouse, Professional Offices, Churches, Distribution Facilities, Restaurants, Recreation, and Multiple and Single Family Residential projects. We are also familiar with all types of construction including precast concrete, steel, masonry, wood framing and pre-engineered metal buildings.

Through our association with a number of capable construction companies, we are able to provide Design-Build and Construction Management services in addition to the traditional Design-Bid-Build project delivery method.


We maintain memberships in a number of related associations including the American Institute of Architects, Life Service Network, The Affordable Assisted Living Coalition, Construction Specifications Institute, Precast Concrete Institute, the International Council of Shopping Centers and others.


We are LEED design professionals and sensitive to the growing movement toward green architecture. We are also CDB certified to do business with the State of Illinois. We are familiar with all federal, state, and local codes and maintain strong relationships with many local governing agencies.

Our Team

Thad Gleason

Owner / Principal

Mr. Gleason is a licensed architect in the states of Illinois and California and has over 20 years of experience in architectural and structural design.

Mr. Gleason was born and grew up in Kewanee, Illinois. He later moved to Oswego, Illinois with his parents and five brothers and sisters where he graduated from Oswego High School in 1975. He attended the University of Illinois at Chicago where he graduated with a Bachelor of Architecture degree in 1981. After a three year apprenticeship he received his license to practice architecture in 1986.

He has served as staff designer for the Illinois Central Gulf Railroad where he prepared plans for railroad bridges and other structures. He has experience as an architectural engineer with an established downtown Chicago engineering firm where he handled various engineering projects including:

  • Addition and rooftop heliport at Children's Memorial Hospital, Chicago, IL

  • Miscellaneous restoration and renovation work at Northwestern University in Chicago and Evanston, IL

  • A new 110 ft. tall freestanding scoreboard for the Ohio State University football stadium, Columbus, OH

  • Interior remodel of the Peoples Gas Building, Chicago, IL

He has over seven years of experience as chief architectural designer for an architectural firm in Southern California where he designed and managed over 80 commercial and office projects. A few of his major projects include:

  • Six new car dealerships in Orange and Riverside Counties, California

  • Aviation Park Recreational Facility for the City of Redondo Beach, CA

  • Monarch Plaza, a 30,000 s.f. office building in Dana Point, CA

  • Several 100,000+ s.f. retail shopping centers throughout Southern California

  • Travelers Inn 250 room lodge, near Salt Lake City, UT

As Vice President of Architectural Operations for RR Browne & Associates, LTD, he was involved in the design and construction administration of a number of projects including:

  • Merlin Muffler & Brake stores in Illinois, Texas, Georgia

  • World Cafe, Coffee House and Cigar Bar, Downtown Aurora Restoration, Aurora, IL

  • Coates Technical Center for Masonite Corporation, West Chicago, IL

  • Batavia Land Company, Ameritech, Batavia, IL

  • Morningstar Community Church, New Church, Aurora, IL

  • Jigged Ventures 4-tenant office warehouse distribution facility, Batavia, IL

  • Tri-State Distribution Center, 480,000 s.f. remodel of existing industrial building

  • Finch & Barry Properties, 35,000 s.f. Cross Dock Truck Facility, Elmhurst, IL

Mike Koehl

Project Architect

Mike has been involved in the practice of Architecture for 20 years. He is currently licensed in the states of Illinois and Wisconsin. He has worked on many types of buildings: single family residential, luxury high rise multi-family, commercial office buildings high rise and low rise, resort hotels, and specialty buildings. After receiving his Bachelor of Architecture in design and planning at The Illinois Institute Of Technology Mike has gone on to work on many projects. The following are a few of the projects which Mike has been involved with as Project Architect or Project Designer:

  • Geneva National Project single family & town homes and golf course, Lake Geneva, WI

  • The Abbey Resort Hotel, Lake Lawn Lodge, Lake Geneva & Delavan, WI

  • The Abbey Spa and Health Club, Lake Geneva, WI

  • Geneva Lakes Kennel Club, Delavan, WI

  • Knickerbocker Hotel renovation, Chicago, IL

  • Barclay Hotel Renovation, Chicago, IL

  • Waterloo Holiday Inn, Waterloo, IA

  • One Congress Center conversion, Chicago, IL

  • Oakbrook Terrace Corporate Center office complex, Oakbrook Terrace, IL

  • The DuPage Club private club, Oakbrook Terrace, IL

  • Drury Lane Oakbrook Terrace dinner theater, Oakbrook Terrace, IL

  • KTTV television station, Los Angeles, CA

  • KRIV television station, Houston, TX

  • KDVR television station, Denver, CO

  • Leprino Foods refrigerated cheese processing plant, NY

Mike worked for RR Browne & Associates since March of 1999 and served as Project Architect on the following:

  • Compass International Corporate headquarters in Aurora, IL

  • Lincoln Professional Center, Four Tenant Office Complex in St Charles, IL

  • East Wilson Street Business Park, Batavia, IL

  • Tuffy Muffler Facility, Elgin, IL

  • Finch & Barry Properties, Ltd., Delany Road Truck Terminal, Gurnee, IL

  • Finch & Barry Properties, 57,000 s.f. Cross Dock Truck Facility, Chicago Ridge, IL

  • Su Family Residence, 7,200 s.f. new home in South Barrington, IL

  • Trinity Church, Naperville, IL

Mike has continued to assist Gleason Architects, P.C. on our recent and ongoing projects including:

  • Midewin National Tallgrass Prairie, Wilmington, IL

  • Heritage Woods Assisted Living Facility, Batavia, IL

  • Riverwoods Christian Center, St Charles, IL

Diane Duncan

Project Architect

Diane has been involved in the practice of Architecture for 8 years. She has worked on many types of buildings including multi-story residential buildings, high end precast single family homes, schools and home additions. After receiving her Bachelor of Art and Architecture degree at The University of Illinois Chicago Campus she has gone on to work on several different types of projects. The following are a few of the projects which Diane has been involved with as Project Architect or Project Designer:

  • Heritage Knolls Subdivision

  • Heritage Ranch, Bolingbrook, IL

  • Spec House, Plainfield, IL

  • The Ashton House, Bolingbrook, IL

  • The Bourne Cabins, Marsailles, IL

Diane worked for Dukane Precast, Inc from March 1997 to February 2005, where she was the Architectural Engineering Manager, Residential Division. These are a few of the projects that she was the Project Architect on:

  • 550 West Wellington, Chicago, IL (9 Story Residential Building)

  • 5230 North Kenmore, Chicago, IL (5 Story Residential Building)

  • 6531-6537 South Woodlawn Avenue, Chicago, IL (6 Unit Residential Building)

  • Williams Residence, Bolingbrook, IL (Residence)

  • Pernankil Residence, Bolingbrook, IL (Residence)

  • Jack Residence, Plainfield, IL (Residence)

  • Suwanski Residence, Addison, IL (Residence)

  • New Lenox School Additions

Diane joined the firm of Gleason Architects, P.C. in February 2005, and immediately began work on the following projects:

  • Zadrozny Residence, St Charles, IL

  • United Land Development (Color Elevations)

  • Arrington Woods, P.U.D.

  • Berkeley Crossing (Commercial Center)

  • Various Dunkin Brands Restaurants

  • Lot 3, The Landings Commercial Center

  • Various Tenant Improvements

James Marston

Project Manager

James graduated from the University of Illinois at Chicago in 1994 with a Bachelor of Architecture degree with an emphasis on Construction Technology. He has 18 years of professional experience, primarily in commercial/corporate architecture.


Shortly after graduation, he became an Intern Architect with Rudolph and Associates, a primarily residential Architectural firm located in Chicago, Illinois.  Some of the projects he was involved with include:


<          Numerous residential additions and interior renovations in Chicago and neighboring suburbs

<          New residence in Hinsdale, Illinois

<          New residence in Washington Island, WI


He has 15 years of commercial, civic and corporate experience working for Newman Architecture in Naperville, Illinois.  Joining the firm in 1995 as an Intern Architect and leaving in 2011 as a Project Architect, he developed the necessary skills to take a project from Schematic Design through construction. Some of his completed projects include:


<          North Riverside Public Library in North Riverside, Illinois

<           Kelvin Grove Elementary School in Lockport, Illinois

<          Executive Suites and Boardroom Renovation for Rotary International in Evanston, Illinois

<           St. Thomas of Villanova Addition in Palatine, Illinois

<           Wind River Corporate Offices in Lombard, Illinois

<           National Louis University – West Campus in Lisle, Illinois

<           National Louis University – North Campus in Skokie, Illinois

<           National Louis University – Northwest Campus in Wheeling, Illinois

<           Renovations to the Library / Chapel at Dominican University in River Forest, Illinois

<           Wav, Inc. Corporate Offices in Aurora, Illinois

<           St. Michaels Parish Center in Orland Park, Illinois

<           Marmon Group in Chicago, Illinois

<          Old Saint Mary’s School in Chicago, Illinois


In 2012 James joined Gleason Architects, P.C. as a Project Architect, he is currently involved with the following projects:


<      Heritage Woods of Freeport in Freeport, IL

<      Deer Path Supportive Living Facility in Huntley, Illinois

<      St. Anthony Supportive Living Facility in Lansing, Illinois

<      Pecatonica Pavilion in Pecatonica, Illinois

<      Aegean Med Transitional and Restorative Care Complex in Lockport, Illinois

<      Long Grove Senior Care in Long Grove, Illinois


Mr. Marston is currently licensed in Illinois and maintains membership in the American Institute of Architects and National Council of Architectural Registration Boards. He is also a volunteer coach for many youth programs in Plainfield, Illinois.

Ken Ewing

Architectural Drafter

Have a question or a project you'd like to discuss? Contact us today.